A slipper is a safetynet, not a crutch. I've watched some youtube vids of guys on liter bikes going from full throttle, 160mph down the straight from 6th gear to third in about a second and a half. Kinda makes me jealous when I wheelhop it in to a corner thinking I'm going down to second and wind up in first.
That's where I want to get to. Being able to break it down as I approach the corner and be nice and smooth while doing it.
When I first started working on my throttle blipping I found it very hard to blip it while staying steady on the brakes. I found myself accidentally stabbing the brakes while trying to blip the throttle.
I've gotten better at that, now I'm trying to work on not taking so long between the blip and clutch release that I lose the benefit of the blip (rev-matching) in the first place. And I'm also working on being quicker with the whole process, but I figure that will continue to get better as I get smoother. Sometimes I get in a groove and feel like I'm nailing it, and sometimes it just feels...off.